Mask



FIG. 1 is a perspective view of a mask showing my new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof.

FIG. 6 is left side elevational view thereof; and,

FIG. 7 is a right side elevational view thereof.

CLAIM The ornamental design for a mask, as shown and described.